Various parts of my body trembles occasionally, and I have other symptoms. What is the cause?

Hi doctor,

I have hand trembling intermittently. I have trembling occasionally in my lips, shoulder, leg, and thigh. It takes a few seconds to feel heat or cold especially at the bottom of the feet. When I stand up from an inclined sitting position, I have mini-episodes of blackouts. My lower back of the head hurts a lot. I have painful sharp pain at the tip of my fingers. I have disturbed sleep. I have sharp pain in my chest and sternum. I have dizziness while climbing a spiral staircase. I have these issues for a few months. I feel disconnected from the body. While holding a pen, my hand seems to be weak. I have sudden jerks in my body parts. My spine hurts at times. I hear click like cracks on the hand. I consulted a doctor. I have done a chest X-ray, blood test, ECG, and blood pressure. All the results came back normal. My symptoms came on and off while doing these tests.